I am saying both. It is not difficult to buy at the ask in my experience.
But it is very difficult to sell your position afterward. It doesn't matter that the posted bid price and bid size are both positive values and that my size matches the bid size. I set my limit sell order well below the bid price (50% below) and could not get a fill... Then I looked at other posted prices for gold, silver, etc to see if it is common for the bid price to be higher than the ask, indeed too many quotes are like that.
But it is very difficult to sell your position afterward. It doesn't matter that the posted bid price and bid size are both positive values and that my size matches the bid size. I set my limit sell order well below the bid price (50% below) and could not get a fill... Then I looked at other posted prices for gold, silver, etc to see if it is common for the bid price to be higher than the ask, indeed too many quotes are like that.